Simplest Server Ever
Use command line tool
nc, short for NetCat. On almost every unix system. IT’S TCP. NOT HTTP. Just a simple client/server relationship.
Set up a listener on port 1234…
nc -l 1234
Connect as a client to port 1234…
nc 127.0.0.1 1234
That’s it. If you type a message in one, it will appear in the other.